Work stop for die sets



Sept. 26, 1933. R. BESOCKE WORK STOP FOR DIE SETS Filed Dec. 9, 1931 X Km INVENTOR. jfznkr/flagaaXe A TTORNE Y.

Patented Sept. 26, 1933 7 PATE NT oFFIcE J WORK STOP FOR DIE SETS Richard Besocke, Chicago,

Ill., 'assignor to- Danly Machine Specialties, Inc.,.Chicago, Ill., a corporation of Illinois I Application December 9, 1931. Serial No. 579,909

3 Claims. (01164-59) This invention relates to that class of automatic work stop appliances for die sets of punching presses in which'a vertically movable stop stem, capable of oscillatory movement, depends into the path of the work, is lifted from a stop engagement in a'punched opening in the work to engage and ride on top thereof and drop to a succeeding opening in said work and thus attain a stop for the work in proper position for a succeeding punching operation. And this improvement has for its object:

To provide a structural formation and combination of parts whereby an accurate and effective automatic operation of the appliance is attained, with the construction permitting of the appliance being arranged in any desired direction with relation to the direction in which the strip of material being punched has movement, all as will hereinafter more fully appear. In the accompanying drawing:

Fig. 1 is a fragmentary vertical sectional elevation, on line 1-1 Fig. 2, illustrating the preferred form of the invention.

Fig. 2 is a similar horizontal section on line 2-2 Fig. 1.

Fig. 3 is an enlarged detail sectional elevation of the stop stem and its associated rocker bar.

Like reference numerals indicate like parts in the several views.

The drawing shows a portion of the movable head 1 of a standard die set, a like portion of the stationary base 2 thereof, and a like portion of the stripper plate 3 having fixed attachment to r the base 2, as usual.

In the preferred form shown, the operating rocker bar 4 of the appliance is of a rectangular bar shape, and is fitted to a similar form of recess in the top face of the stripper plate 3, in which it is pivotally mounted near its mid-length by a cross pin 5, with the upper surface of the rocker bar on a level with the upper surface of the stripper plate.

At one end the rocker bar 4 is cut away on its under side, as shown, so as to permit of a limited rocking movement of the bar in its receiving recess in the stripper plate, while at its other end said rocker bar is formed with a reduced pin extension 6 for operative engagement with the stop stem now to be described.

The stop stem 7 above referred to, is preferably of a cylindrical form and is housed in a vertical cylindrical orifice 3' of the stripper plate 3 aforesaid, With the orifice 3' having a slightly greater diameter than the stem 7, in order to permit of limited independent swinging movement of the stem 7 in any required direction in actual use of the appliance. The stop stem 7 is of. a'length adapting its lower end to have adjacent relation to the top surface of the stationary die base 2 aforesaid, in a normal condition of rest of the appliance. I I

Near its upper end the stop stem 7 is formed with a flaring recessB adapted to receive and have operative engagement with the reduced pin extension 6 of the operating rocker bar 4, as

shown. And in encircling relation to the flaring recess 3, the stop stem is formed with a peripheral groove 9, adapted to receive and have operative connection with the circular eye of the resilient positioning member now to be described.

The resilient positioning member above referred to, comprises an elongated shank portion 10 of resilient rod metal, arranged in a longitudinal groove 11 in a side of the rocker bar 4, with one, end provided with a circular eye 12 adapted for operative engagement in the aforesaid eripheral groove 9 of the stop stem.

Th other end of the aforesaid resilient shank member is formed with a hook shaped angular extension 13 adapted for holding engagement in a lateral offset orifice 14 in the rocker bar 4, with the offset portion of said orifice of a larger diameter adapted to receive a dislodging pin in an operation of disassembling the parts of the appliance.

As usual in the present type of work stop appliances, the free end of the rocker'bar 4 is arranged in the path of a vertically adjustable operating stud bolt 15 carried by the movable die head 1, with said end of the rocker bar 4 having a yielding upward tendency under the influence of a spring member 16 interposed between the rocker bar 4 and the stationary base 2 of the die set as shown.

With the present appliance as the rearmostwall of a punched orifice in the work operated on, moves against the lower end of the stop stem 7, it will initially push the stop stem into an oblique position in the direction of movement of the work strip and with its lower portion in stop abutment against a wall of the orifice 3 of the stripper plate 3, and thus provide a stop against further movement of strip of work operated on during the succeeding punching operation.

The upward lift or release of the stop stem 7 from the described engagement with the piece of work is attained by an operative contact of the adjustable stud bolt .15 of the movable die bar 4. With such upward movement of the stop stem '7, it will regain its normal vertical position as soon as it passes above the upper facev of the piece of work under the resilient influence of the positioning member 10, aforesaid. And in'regaining an operative position in a succeeding punched opening in the piece of work it will 7 initially ride on the top surface of said piece of work and then drop into said punched opening under the influence of the rocker bar 4 and the spring member 16.

A material feature in this appliance lies in the fact that the resilient positioning means 10 operates to restore the stop stem-'7 to itsnorrnal position after the samevhas obliquely displaced ber imposing yielding right angle relation between the rocker bar and the stop stem, the

same comprising a resilient rod having fixed attachment at one end to the rocker bar and at the other end formed with a circular loop engaging the peripheral groove of the stop stem.

2. In a work stop of the type described, the combination of a rocker bar, a depending stop stem formed with a peripheral groove near its upper end and having operativezconnection with anend offlthe rocker banandi-a resilient member imposing yielding right angle relation between the rocker bar'and the stop stem, the same comprising a resilient rod having fixed attachment at one end to the rocker bar and at the other end formed withla circular loop engaging the peripheral groove of the stop stem, the connections between the stop stem and the rocker bar having close adjacent relation.

3. In avwork stop of the type described, the combination of a rocker bar, a depending stop stem formed with a peripheral groove near its upper end and having operative connection with anend of the rocker bar, anda' resilient: member imposing yieldingrightanglerelation between the rocker bar and thestopstem, the same comprising a resilient rod having ashank: portion adapted for fixed attachment to the side of the rocker'bar and acircularloop at its'free end for engagement in the peripheral groove of the stop stem. 1 7

RICHARD BESOCKE. 

